Year	Percent
1950	27.7592
1955	25.89811
1960	23.89766
1965	26.57737
1970	26.5127
1975	29.67738
1980	29.13444
1985	29.48898
1990	29.7225
1995	29.09725
2000	28.92201
2005	28.79482
2010	28.71171
2015	28.95152
2020	28.6675
2025	27.9208
2030	26.76561
2035	24.76399
2040	22.87535
2045	21.40294
2050	20.31397
2055	19.85378
2060	19.44424
2065	19.03325
2070	18.61465
2075	18.3311
2080	18.26494
2085	18.37462
2090	18.55083
2095	18.67671
2100	18.70993